40 OLEACINA. 



0. OARMINENSIS, Morelet. PL 9, fig. 25. 



Rather solid, closely plicate, very minutely decussated, brown- 

 ish rose-color to whitish, here and there strigate with chestnut ; 

 whorls 7, suture narrowly granularly margined. Length, 48 mill. 



IsL Carmen, Lake Yucatan. 



A variety 0: yellowish white 'and smaller, is described by 

 Crosse and Fischer. 



O. DECUSSATA, Deshayes. PL 9, fig. 28. 



Moderately solid, closely longitudinally striate, decussated by 

 thinner spiral striae ; reddish brown or corneous ; whorls 7, 

 suture margined and crenulated ; columella twisted. 



Length, 45 mill. 



Mexico, 1 ex as. 



0. corneola, W. G. Binney, is a synonym. The shell is closely 

 related to the preceding species. 



O. EQUADORIANA, Pfeiffer. PL 9, fig. 19. 



Somewhat solid, finely regularly plicate-striate, sometimes 

 dichotomous, spirally interruptedly very minutely lineated ; 

 shining, reddish corneous ; whorls 7, suture thread-margined and 

 rudely granulated. Length, 62 mill. 



Val de Pilaton, Ecuador. 

 O. TENELLA, Strebel. PL 8, fig. 11. 



Shell thin, pellucid, plications less crowded than in 0. decus- 

 sata, flatter and unequal, the spiral striae less distinct; light 

 yellowish pink, darker towards the suture and on the peristome 

 and columella ; whorls 6, suture margined ; columella slightly 

 twisted. Length, 35 mill. 



Near Vera Cruz, Mexico. 



0. GHIESBREGHTI, Pfeiffer. PL 8, figs. 16, 18. 



Thin, closely longitudinally plicate, decussated by very narrow 

 spiral striae ; orange-white, peristome darker-bordered ; whorls 

 7, turgid and subangulated above, suture crenulately thread- 

 margined ; columella obliquely plicate towards the base. 



Length, 52 mill. 



Chiapa, Mexico. 



Var. /?: MINOR. Very light olivaceous yellow, whorls 6, inte- 

 rior pearly white, peristome bordered with light rose-color, 



